But they're also faced with an enormous problem. Tourists don't always conveniently return their cars and campers to the same city where they hired them out.

That means they need to get the stranded vehicles back to the busiest pick-up points as soon as possible.

Self-driving cars are still in the realm of science fiction, so rental companies are forced to load their vehicles onto huge car-carrying trucks, move them by train, or send out staff to drive them back.

That's hugely expensive.

This is where relocation drivers come in. It doesn't matter if you're young or old, a backpacker, student, or a family.

As long as you've got a licence and you're over 18, you're in.

The industry-wide practice has spawned several aggregator websites, like Nesdale's, which pull together the offers available so you don't have to try and hunt them out individually.